Valve grinder



T. J. FEGLEY ET AL New 27, 1928.

VALVE GR I NDER Filed Aug. 12, 192 6 l\ MA Iill Z? I T ////111 save 5 y Patented Nov. 27, 1928.

THOMAS J'. FllGLEY AND GEORGE O. LEOPULD, O35 FEHILADEL?HIA, PENNSYLVANIA,

ASSIGNOES TO NORTH BROS COREORATION OF PENNSYLVANIA.

MFG 00., 6E P'EELADELII'IIA, PENNSYLVANIA, A

VALVE GRINDER.

Application filed August 12, 1928. Serial Nof128f794.

, One object of our invention is to make a valve-grinding tool which will be simple in Fig. 3; and

Fig. 5 is a. sectional plan view on the line 55, Fig. 1. r i

. The frame 1 of the valve-grinding tool may be of any shape desired. In the present in stance, the frame encloses the gearing and a cover-plate 2 is threaded and adapted to a. threaded opening in the casing so as to make a tight oint, and the interior of this frame is preferably filled with grease or other lubricant.

The cover-plate carries the bearing 11 for a shaft 10. The spindle 3 extends longitudinally through the frame and is adapted to bushings 4 and 5 in the frame. These bushings are detachable and can be removed with the spindle when necessary. At the outer end of the spindle is a chuck 6, to which a valveengaging tool may be secured.

The inner end of the spindle has an annular groove 7 directly above the bushing l. A U shaped key 8 is located in the groove and rests on the bushing. A ball-bearing 9 is located between the lower bushing 5 and the chuck.

The driving-shaft 10 is at right angles to the spindle 3 and has a handle 12 at its outer end and a cam 13 at its inner end. Secured to the shaft back of the cam 13 is a bevel gearwheel 14 which meshes with two bevel pinions 15 and 16 loose on the spindle.

Each pinion has a number of key-slots 17 in its hub, into which is projected a key 18 shown clearly in Fig. 3. The key 18 is located in a longitudinal slot 19 in the spindle 3. Loose on the spindle 3 is a spool 20, having a flange 21 at each end forming an annular groove for the cam 13 of the shaft 10, so that when the shaft is rotated, the spool is reciprocated freely on the spindle.

The key 18 has two projections 22. One projection is at one end of the spool and the other projection is at the opposite. end of the spool. As the spool is reciprocated, the key is moved longitudinally in its slot.

Each end of the key is beveled and rides under bars H3 and 2a which extend across the slot 19 as shown clearly in Fig. 3. Located in pockets in the slot 19 are coil-springs 28, which yieldingly force one end of the key out of "he slot when not controlled by a cross-bar. The cross-bar 2a is located nearer the centre of the shaft 10 than the other cross-bar so as to hold the end 26 of the key in one of the keyslots in the pinion 15 a greater length of time than the opposite end of the key is held in the pinion 16. This causes the spindle to have a progressive forward feed as well as a reciproeating movement, so that the valve will not grind at one place but will be gradually turned as it is reciprocated.

Enclosing the upper bearing a and the innerend of the spindle is a suitably shaped hand-hold 27.

As the handle 12 is turned, the gear-wheel 1% turns the pinions 15 and 16 in opposite directions, and the cam 13 reciprocates the spool and controls the movement of the key 18, which first engages one pinion and then the othe pinion. causing the reciprocation of the spindle 3, and as the key dwells a greater length of time in the hub of one pinion than in the other inion. the spindle is moved forward each reciprocation, so that the grinding action is distributed.

The abate-described tool is compact and substantial and can be readily operated.

We claim 1. The combination in a valve grinder, of a frame having bearings; a spindle and a aft mounted in the bearings, the shaft be ing at right angles to the spindle; two bevel piniens loose on the spindle; a flanged spool loose on the spindle and located between the two bevel pinions; a bevel gear on the shaft meshing with the pinions; a cam on the shaft engaging and reciprocating the spool as the key to engage one or the other of the pinions,

one'end of the key having a longer dwell 1n 1ts hub than the other key so that the spindle will be moved progressively forcam on the shaft engagingthe spool; a pawl actuated by the spool arranged to one or the other of the pinions, said pawl having extenslons w1th beveled ends; crossbars on the spindle under which the pawl extends; and a spr1ng tending to force the pawl 1n engagement with the pamons.

8. The combination in a valve-grrinder of a frame having a casing; a spindle extending through the casing; pinions on the spindle; a spool loosely mounted on the spindle; a detachable cap plate having a bearing; a shaftmounted in the bearing and having a gear-wheel thereon meshing with thepin ions; a cam on the shaft engaging the spool; a pawl actuated bythe spool arranged to engage one or the other of the pinions, said pawl having extensions Withbeveled ends; cross-bars on the spindle under which the pawl extends; and a spring tending to force the 1 awl in engagement with the pinions one cross-bar beingnearer the centre of the camsha t than the OtllQT'ClOSS-bftl, so asto hold the pawl in engagement with one pinion "for a. greater length of time than with the other pinion, to cause the spindle to have a progressive reciprocating movement.

THOMAS J. F GLEY; enoson o. LnoPoLn. 

